path: root/usb-i2c-sl018/tuer-rfid.c

/*
 *  spreadspace avr utils
 *
 *
 *  Copyright (C) 2012 Christian Pointner <equinox@spreadspace.org>
 *
 *  This file is part of spreadspace avr utils.
 *
 *  spreadspace avr utils is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  any later version.
 *
 *  spreadspace avr utils is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
 */

#define TAG_STA_PIN PINB
#define TAG_STA_BIT 4
// #define PIN_B_INTERRUPT 1<<TAG_STA_BIT
//#define PIN_C_INTERRUPT 0
//#define PIN_D_INTERRUPT 0
// #define CARD_IN 0xe1
// #define CARD_OUT 0xe0
#define CARD_BOOL ( (TAG_STA_PIN >> TAG_STA_BIT) & 1)

#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>
#include <avr/power.h>

#include "util.h"
#include "led.h"

#include "LUFA/Drivers/Peripheral/TWI.h"
#include "LUFA/Drivers/Misc/RingBuffer.h"

#include <avr/eeprom.h>
#define EEPROM_SIZE 1024

typedef unsigned char keyslot_t[8];
keyslot_t EEMEM keyslots[EEPROM_SIZE/sizeof(keyslot_t)];

const uint8_t SL018_ADDR = 0xa0;
const uint8_t SL018_WRITE = 0;
const uint8_t SL018_READ  = 1;
//============================================
//  Command List, preamble + length + command 
//============================================

const unsigned char SL018CMD_ComSelectCard[]          ={1,1};                                               
const unsigned char SL018CMD_ComRedLedOn[]            ={2,0x40,1};
const unsigned char SL018CMD_ComRedLedOff[]           ={2,0x40,0};
const unsigned char SL018CMD_ComGetFirmwareVersion[]           ={1,0xF0};

unsigned char twi_rcv_buff[256];

typedef struct __attribute__((__packed__))
{
  uint8_t command;
  uint8_t status;
  char data[sizeof(twi_rcv_buff)-3];
  uint8_t len;
} SL018CMD_MESSAGE;

SL018CMD_MESSAGE * twi_message = (SL018CMD_MESSAGE *) &twi_rcv_buff;
uint8_t card_status =0;

FILE usb_stream;
FILE * usb = &usb_stream;
/*
             LUFA Library
     Copyright (C) Dean Camera, 2012.

  dean [at] fourwalledcubicle [dot] com
           www.lufa-lib.org
*/


#include <LUFA/Drivers/USB/USB.h>
#include "lufa-descriptor-usbserial.h"

USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
  {
    .Config =
      {
        .ControlInterfaceNumber         = 0,

        .DataINEndpointNumber           = CDC_TX_EPNUM,
        .DataINEndpointSize             = CDC_TXRX_EPSIZE,
        .DataINEndpointDoubleBank       = false,

        .DataOUTEndpointNumber          = CDC_RX_EPNUM,
        .DataOUTEndpointSize            = CDC_TXRX_EPSIZE,
        .DataOUTEndpointDoubleBank      = false,

        .NotificationEndpointNumber     = CDC_NOTIFICATION_EPNUM,
        .NotificationEndpointSize       = CDC_NOTIFICATION_EPSIZE,
        .NotificationEndpointDoubleBank = false,
      },
  };

void EVENT_USB_Device_ConfigurationChanged(void)
{
  CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
}

void EVENT_USB_Device_ControlRequest(void)
{
  CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
}
/* end LUFA CDC-ACM specific definitions*/

unsigned char sl018_send_buffer(const unsigned char * buffer)
{
    uint8_t len = 0;
    uint8_t pos = 0;
    //unsigned char ret;
    len = buffer[0];
    if (TWI_StartTransmission(SL018_ADDR | SL018_WRITE,10) == TWI_ERROR_NoError)
    {
        for(pos=0; pos<=len; pos++)
          if( ! TWI_SendByte(buffer[pos]))
          {
             TWI_StopTransmission();
             return 1;
          }
        // Must stop transmission afterwards to release the bus
        TWI_StopTransmission();
    } else {
     return 1;
    }
    _delay_ms(50);
    if (TWI_StartTransmission(SL018_ADDR | SL018_READ,10) == TWI_ERROR_NoError)
    {
        TWI_ReceiveByte(&len, 0);
        twi_rcv_buff[255]=len;
        for(pos=0; pos<len; pos++)
          if (! TWI_ReceiveByte(&twi_rcv_buff[pos], (pos == len-1) ? 1:0 ) )
          {
             TWI_StopTransmission();
             return 1;
          }
        // Must stop transmission afterwards to release the bus
        TWI_StopTransmission();
    } else {
     return 1;
    }
    return 0;
}


void flash_eeprom_from_usb(void)
{
  keyslot_t keyslot;
  uint8_t keyslot_pos=0;
  uint8_t byte_pos=0;
  fprintf(usb,"Flashing keys:\n\r");
  fflush(usb);
  for(keyslot_pos=0;keyslot_pos<EEPROM_SIZE/sizeof(keyslot);)
  {
    int16_t BytesReceived = CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface);
    while(BytesReceived >0) {
      keyslot[byte_pos++]=fgetc(usb);
      BytesReceived--;
      if (byte_pos == sizeof(keyslot))
      {
        byte_pos=0;
        eeprom_write_block(&keyslot,&keyslots[keyslot_pos],sizeof(keyslot));
        keyslot_pos++;
        fprintf(usb,".");
        fflush(usb);
        led_toggle();
      }
    }
    CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
    USB_USBTask();
  }
  fprintf(usb,"\n");
}

void dump_eeprom_to_usb(void)
{
  keyslot_t keyslot;
  uint8_t keyslot_pos=0;

  for(keyslot_pos=0;keyslot_pos<EEPROM_SIZE/sizeof(keyslot);keyslot_pos++)
  {
    eeprom_read_block(&keyslot,&keyslots[keyslot_pos],sizeof(keyslot));
    for (uint8_t i=0; i< sizeof(keyslot); i++)
      fprintf(usb,"%02X",keyslot[i]);
    fprintf(usb,"\n\r");
  }
}

bool sl018_send_buffer_check_error(const unsigned char * buffer)
{
  SL018CMD_MESSAGE * send_twi_message = (SL018CMD_MESSAGE *) (buffer+1);
  if(sl018_send_buffer(buffer))
  {
    fprintf(usb, "I2C error\n\r");
    return 0;
  } else {
    if(twi_message->status)
    {
      CDC_Device_SendString(&VirtualSerial_CDC_Interface, "SL018 Cmd,Error: ");
      fprintf(usb,"SL018 Cmd,Error: %02X,%02X\n\r",twi_message->command,twi_message->status);
      return 0;
    }
    if(send_twi_message->command != twi_message->command)
    {
      fprintf(usb,"SL018 Cmd missmatch: send, rcv: %02X,%02X\n\r",send_twi_message->command,twi_message->command);
    }
  }
  return 1;
}


void handle_cmd(uint8_t cmd)
{  
  switch(cmd) {
    case 'r': reset2bootloader(); break;
    case 'f': //get cardreader firmware version
             if(sl018_send_buffer_check_error(SL018CMD_ComGetFirmwareVersion))
             {
               fprintf(usb, "%s\n\r",twi_message->data);
             }  
             break;
    case '4': //turn cardreader led off
             if(sl018_send_buffer_check_error(SL018CMD_ComRedLedOff))
               fprintf(usb, "ok\n\r");
             break;
    case '5': //turn cardreader led on
             if(sl018_send_buffer_check_error(SL018CMD_ComRedLedOn))
               fprintf(usb, "ok\n\r");
             break;
    case 'e': //flash eeprom
             flash_eeprom_from_usb();
             break;
    case 'd': //flash eeprom
             dump_eeprom_to_usb();
             break;
    case 's': //get eeprom size
             fprintf(usb,"%d\n\r",EEPROM_SIZE);
             break;
    default: fprintf(usb, "error\n\r"); return;
  }
}

void card_in_action(void)
{
  uint8_t pos;
  fprintf(usb, "CARD IN: ");
  if(sl018_send_buffer_check_error(SL018CMD_ComSelectCard))
  {
   for (pos=twi_message->len - 4 ; pos< 255; pos--)
   {
     fprintf(usb,"%02X",twi_message->data[pos]);
   }
   fprintf(usb, "\n\r");
  }  
}

int main(void)
{
  MCUSR &= ~(1 << WDRF);
  wdt_disable();

  cpu_init();
  led_init();
  USB_Init();
  TWI_Init(TWI_BIT_PRESCALE_1, TWI_BITLENGTH_FROM_FREQ(1, 200000));
  sei();
  CDC_Device_CreateStream(&VirtualSerial_CDC_Interface,usb);
  for(;;) {
    int16_t BytesReceived = CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface);
    while(BytesReceived > 0) {
      handle_cmd(fgetc(usb));
      BytesReceived--;
    }
    if(    CARD_BOOL != card_status)
    {
      card_status = CARD_BOOL;
      if (!card_status)
      {
        card_in_action();
      }
    }
    CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
    USB_USBTask();
  }
}